Achieving 256 × 256‐Pixel Color Images by Perovskite‐Based Photodetectors Coupled with Algorithms

Abstract Perovskites have been found with their exceptional optoelectronic properties that may bring new options to high‐performance cameras. However, the best images obtained by perovskite‐based photodetectors (PDs) have only 32 × 32 pixels, far below megapixels of camera images. In this study, a perovskite single‐PD color imaging prototype coupled with computation algorithms is fabricated, by which images with 256 × 256 pixels, whose quality has prevailed over those obtained by any perovskite‐based device so far are obtained. The technology shows its unique advantages by obtaining satisfying photographs, even when the PD is covered with frosted glass/moving smoke or facing a wall instead of the target, in addition to possessing some ability to resist ambient light interference. Moreover, a new Q factor is proposed to evaluate new‐material‐based PD for the imaging technology and prove its usability by comparing an atomic‐layer‐deposition (ALD)‐Al 2 O 3 optimized CsBi 3 I 10 PD and an unoptimized CsBi 3 I 10 PD. Finally, the material choices are successfully extended to other types of perovskites, including photovoltaic MAPbI 3 PD (structure: Spiro‐OMeTAD/MAPbI 3 /SnO 2 /FTO), ALD‐Al 2 O 3 MAPbI 3 PD, and ALD‐Al 2 O 3 CsPbBr 3 PD. The technology may bring an innovative approach to improve the performance of cameras and extend the application range of advanced functional materials.